McConnell says even with Missouri in question, the GOP may still have a shot at the majority.

“I think it’s a 50-50 proposition. I think the Senate is going to be close and the presidential race is going to be close and I think all these races are yet to play out between now and November,” he says.

Democrats have more seats nationwide to defend this fall than Republicans do.

The other battleground states are Florida, Ohio, Montana and Massachusetts.